每个特定的browsertab使用会话cookie

I currently have a form that allows a user to edit entries. However, it doesn't seem to be possible to use 1 (specific) cookie per tab. Whenever a user edits an entry, the record in the last tab gets updated.

I've tried the following in my main script (eventfilters.php):

<?php
$cookie_name = $_SESSION['username'].md5(time());
session_name($cookie_name);
setcookie(session_name($cookie_name),session_id(),time()+"300");
if(!isset($_SESSION)){ session_start(); }

if (isset($_GET['edit'])){  
    // Pass cookiename in url variable $cookie, so it gets caught by $_GET['cookie']
    echo '<form action="eventfilters.php?save&cookie='.session_name().'" method="post">';

} else if (isset($_GET['save'])){
    if(isset($_GET['cookie'])){
        error_log("SAVE ".$_GET['cookie']); // Displays cookie url variable set by form action.
        error_log("LOW ".$_SESSION['level_low']); 
        // Displays correct session value received from ajax
    }
}

?>

`

The ajaxcode (also in eventfilters.php) contains this (called few times when page is already loaded):

$.post("include/severitygroups.php",{'cookie_name': "<?php echo $cookie_name; ?>", 'serialized_sev_groups': serialized_sev_groups}, function(data){});

This seems to pass the right cookiename to the other script, which successfully seems to return $_SESSION['level_low'] (as it appears in the error_log).

<?php
include('pdodb.php');

if(!isset($_SESSION)){ session_start(); }
$cookie_name = $_POST['cookie_name'];
error_log("SCRIPT ".$cookie_name);
error_log("COOKIEDATA ".$_COOKIE["$cookie_name"]);

// populating $_SESSION['level_low']
?>

It seems that the $_GET['save'] is populating the wrong sessions (initialised by the last loaded instance of eventfilters.php), even when the $_GET['save'] logs the right $_SESSION['level_low'] to the errorlog.

What is going wrong?

You can't do it. The best way to do it, is with Ajax, so, you will pass an "ID" to each tab (or page) like:

editPost.php?id=someID

And, each time you press save, you should send your content with your id param to save it.